JPH01256692A - Drilling device - Google Patents

Abstract

PURPOSE:To improve drilling efficiency by providing an air passage for allowing air in a hammer cylinder which is compressed accompanying the downward movement of an air hammer to escape in a device portion while also providing a clay passage for discharging clay. CONSTITUTION:As a drilling pipe 10 is rotated, a drilling device 18 is also rotated and a bit portion 22 starts to drill earth 48. At the same time, air from a compressor via a pipe 12a drives all air hammer 14. Then, the hammer 14 strikes the top portion of the striking portion 24 of a device 20 to advance the bit portion 22 of the drilling device 18 into the earth 48 in the ground by the impact force. At the time of striking, air which exists in a hammer guide 16 is pushed into an air passage 38 by the downward movement of the hammer 14 and discharged out into atmosphere. Further, the clay which is pressed in between a pipe 12b and a pipe 12c is advanced into a clay passage 46 and gets out of the bottom face of the bit portion 22 to be discharged out of a drilling hole 52.

Description

[Detailed description of the invention] (Industrial application field) TECHNICAL FIELD The present invention relates to drilling equipment.

(Prior Art) Conventionally, there has been known an excavating device in which a device portion is attached to the lower end of a rotating hammer cylinder, and a bit portion for performing excavation is provided at the lower end of the device portion.

This device rotates a bit part by rotating a hammer cylinder, and can also move the bit part forward by hitting the top of the device part with an air hammer placed inside the hammer cylinder. When the air hammer is driven, the air in the hammer cylinder is compressed and is released through an air passage provided in the device section. In addition, as an excavation device, a method is known in which a 1if11 hole is provided through the center of the device part and the focus part, and clay is press-fitted into the through hole. The device excavates while rotating the device part and the bit part, and a clay passage is provided in the device part and the bit part to allow the clay to escape.

(Problems to be Solved by the Invention) However, the above conventional drilling equipment has the following problems.

In drilling equipment that uses an air hammer, the air released from the air passage is used to blow up the excavated debris from the bit and discharge it out of the drilling hole, so when the drilling depth exceeds approximately 80 m, the excavated debris is discharged outside. The problem is that it is not suitable for deep excavation.

On the other hand, with the method of press-fitting clay, deep digging is effective because the excavated debris can be discharged together with the clay, but an air hammer cannot be used because the clay is sent into the through hole provided in the center of the device part, and digging is done by rotating the bit part. However, there is a problem that the excavation efficiency is poor.

Therefore, an object of the present invention is to provide an excavation device that has good excavation efficiency and is capable of deep excavation.

(Means for solving problems) In order to solve the above problems, the present invention has the following configuration.

That is, a device section that receives the impact force of the air hammer and the rotational force of the hammer cylinder, and a device section provided in the device section,
In the excavation device having a bit part that excavates earth and sand etc. by the impact force and rotational force, the device part is provided with an air passage for releasing air in the hammer cylinder that is compressed as the air hammer moves downward; The device part and/or the bit part is characterized in that a clay passageway is provided in the device part and/or the bit part to allow the clay to pass therethrough and be discharged to the outside.

(effect) The operation will be explained with reference to FIG.

The air hammer 1 is activated by the air sent into the pipe 12a.
4 hits the upper end of the device section 20.

At that time, air is supplied to the air passage 38 provided in the device section 20.
It is possible to escape upwardly between the pipes 12a and 12b through the pipes 12a and 12b. On the other hand, the clay press-fitted between the pipes 12c and 12b passes through the clay passage 46 provided between the device section 20 and the bit section 22 and exits from the lower surface of the bit section 22.

At this time, since the bit part 22 is rotating, the bit part 22 excavates the earth and sand 48 by competing with the impact force of the air hammer 14, and the excavated debris is discharged together with the clay, allowing efficient deep digging. It becomes possible.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the configuration will be explained.

Reference numeral 10 denotes an excavation pipe, which is rotatable by receiving rotational force from a drive source (not shown).

The excavation pipe 10 includes pipes 12a and 12b.

It has a triple structure of 12c, and is fixed in three layers via a connecting means (not shown).

14 is an air hammer, a known one is used, and the pipe 1
The pipe 12 is connected to the hammer guide 16 connected to the lower end of the pipe 2a.
It is driven by air sent from a.

A drilling device 18 is attached to the lower part of the drilling pipe 10 and is rotatable together with the drilling pipe IO. The drilling rig 18 includes a device section 20 and a bit section 22.

A striking part 24 is formed in the upper part of the device part 20, and the upper end can be struck by the air hammer 14. A spline portion 26 is formed below the striking portion 24, and a plurality of spline grooves 28 are carved in the axial direction on the outer periphery. The spline grooves 28 are provided with engagement pieces 30 radially provided at the lower end of the hammer guide 16.
・is engaged. A male thread is formed on the outer periphery of the engaging piece 30, and is screwed into a female thread 32 formed on the inner wall surface of the lower part of the pipe 12b, so that the excavation device 18 is connected to the excavation pipe 10. Fixed. Note that a gap is formed between the pipe 12b and the portion of the spline portion 26 where the spline grooves 28 are not formed.

A connecting portion 34 is formed below the spline portion 26,
The pipe 12b is connected. A concave groove is carved on the outer periphery of the connecting portion 34, and O-rings 36 are fitted therein to maintain airtightness between the connecting portion 34 and the pipe 12b.

Reference numeral 38 denotes an air passage whose upper end opens at the upper end surface of the striking part 24, passes through the center of the striking part 24 and the spline part 26, and opens at the outer wall and upper surface of the connecting part 34. The opening 38a of the air passage 38 in the connecting portion 34 is located above the O-ring 36.

40 is a large diameter portion, which is formed below the connecting portion 34. The above-mentioned striking part 24, spline part 26, and connecting part 34
The device section 20 is composed of the large diameter section 40 and the large diameter section 40 .

Reference numeral 22 denotes a bit part, which is formed below the large diameter part 40, and has a bit 4 made of cemented carbide for drilling on the outer and lower surfaces.
2... are provided with appropriate mathematical membranes. A plurality of discharge grooves 44 are carved in the outer periphery of the bit portion 22 in the axial direction. The upper surface of the focusing portion 22 is connected to the lower end edge of the pipe 12a.

46 is a clay passage whose upper end is open across the outer peripheral surface of the large diameter portion 40 and the upper surface of the bit portion 22,
It passes through the inside of the bit part 22 and the lower end thereof is open to the lower surface of the focusing part 22 .

Next, the operation of the excavation rig configured as described above will be explained.

The excavation pipe 10 is rotated by a drive source (not shown). Then, the drilling equipment 1 fixed to the drilling pipe 10
8 also rotate together, and the bit part 22 starts excavating the earth and sand 48.

At this time, air sent from a compressor (not shown) drives the air hammer 14 via the pipe 12a. The air hammer 14 strikes the top of the striking part 24 of the device part 20, and the impact force advances the bit part 22 of the excavating device 18 into the earth and sand 48 underground. When the air hammer 14 strikes the striking part 24, the air existing in the hammer guide 16 is pushed into the air passage 38 by the downward movement of the air hammer 14, and the air between the lower end opening of the air passage 38, the pipe 12b, and the outer periphery of the spline part 26 is pushed into the air passage 38 by the downward movement of the air hammer 14. It ascends through the gap → the gap between the pipe 12b and the hammer guide 16 → the gap between the pipe 12b and the pipe 12a, and is released into the atmosphere.

On the other hand, between pipe 12b and pipe 12c, about 40 kg/nf of clay (preferably bentolite kneaded into mortar)
It is continuously press-fitted at a pressure of The press-fitted clay enters into the clay passage 46 from the upper end opening of the clay passage 46. At this time, the O-ring 3 is inserted between the pipe 12b and the connecting part 34.
6... are inserted to prevent clay from entering into the pipe 12b. The clay that has passed through the clay passage 4G comes out from the lower surface of the bit part 22 that is being excavated. The clay coming out takes in the excavated debris of the earth and sand 48 excavated by the bit part 22, ascends between the pipe 12a and the excavated wall surface 50, and is discharged to the outside of the excavated hole 52. At this time, since the bit part 22 is provided with a discharge groove 44, the clay that has taken in the excavated debris can be easily lifted up.

In addition to discharging excavation waste during deep excavation, the clay is sent in to reduce the rotational resistance of the excavation pipe 10 by protecting the soft excavation wall 50 with clay. This is also because it also has a water-stopping effect when groundwater gushes out from the excavated wall surface 50.

Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. be.

(Effects of the Invention) When the excavation device according to the present invention is used, it becomes possible to press in and discharge clay while using an air hammer, so it becomes possible to perform deep excavation using an air hammer, which was previously impossible. Therefore, the excavation device can be driven by both the impact force of the air hammer and the rotational force of the excavation pipe, resulting in significant effects such as efficient deep excavation.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an embodiment of the excavation apparatus of the present invention. 14...Air hammer, 18...Drilling equipment, 20
...Device section, 22...Bit section, 38...
Air passage, 46...clay passage, 48...earth and sand.

Claims (1)

[Scope of Claims] 1. An excavating device having a device part that receives the impact force of an air hammer and the rotational force of a hammer cylinder, and a bit part that is provided in the device part and excavates earth and sand etc. by the impact force and rotational force. , the device part is provided with an air passage for releasing the air in the hammer cylinder that is compressed as the air hammer moves downward, and the device part and/or the bit part allows the clay to be fed to pass through and be discharged to the outside. An excavation device characterized by having a clay passageway for discharging clay.